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BPF tuning

#bpf #qcx20mini

Mike Calvi All Messages By This Member #102242 In the instructions it references the setting from 4-8 o’clock as being ok. ?If it’s on the sides the toroid needs some more or fewer windings based on the side. ? What if it is on the top? I didn’t see any option there. ?I assume it’s ok? thanks, mike
Ronald Taylor All Messages By This Member #102244 Top is ok too Mike. It's good to turn the capacitor through a full revolution. Sometimes there are two peaks and one may be much higher than the other one. As long as you are displaying 08 or so you are working well. Ron toggle quoted message Show quoted text On Thu, May 11, 2023 at 2:56?PM Mike Calvi <mikecalvi@...> wrote: In the instructions it references the setting from 4-8 o’clock as being ok.? If it’s on the sides the toroid needs some more or fewer windings based on the side. ? What if it is on the top? I didn’t see any option there.? I assume it’s ok? thanks, mike
Mike Calvi All Messages By This Member #102246 RR, yes it’s at 08 with 31 bars as the max. ?Did a loop around once each way to verify. thanks! mike
Mike Calvi All Messages By This Member #102247 Well Scratch that.? I put it back together and the max i can get now is a 06. Maybe I mis read.?
Mike Calvi All Messages By This Member #102248 Do these look decent #s before I put it in the case? BPF: 06-31 These bounced around alot but I measured where it was consistently lit up I-Q: 05-27 Lo: 05-31 Hi: 05-25
Ronald Taylor All Messages By This Member #102249 The BPF is too low. The other three depend on the setting of the volume control. As long as they are all minimized it is probably right.? The BPF is acting like something happened to the lowpass filter. The last test signal is introduced at the ?NC, goes through the lowpass filter and then through Q5 to the receiver input.? Are you making decent power output from the transmitter? If not, check for continuity from the BNC center pin to the C29 end of L3.? Ron toggle quoted message Show quoted text On Thu, May 11, 2023 at 17:16 Mike Calvi <mikecalvi@...> wrote: Do these look decent #s before I put it in the case? BPF: 06-31 These bounced around alot but I measured where it was consistently lit up I-Q: 05-27 Lo: 05-31 Hi: 05-25

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